This looks really nice, reminds me of Muzei[1] on Android which also allowed to add effects on the image that was being displayed. Definitely keeping ArtDiario running! Just a little thing: consider making the icon for the menu bar smaller, it's way to big compared to the usual size of the icons on macOS and it makes it look off [2].

[1]: https://play.google.com/store/apps/details?id=net.nurik.roma... [2]: https://ibb.co/3YjkNqh